JVC LT-42HB1BU Service Manual page 38

MAIN PWB CIRCUIT DIAGRAM (16/46) [FRC POWER [DC/DC]]
1
FRCQ Power
TP541
PCB_TP10
+12V
A C542
106p/25V/3216
R542
103/1005
U541
C543
106p/25V/3216
7
EN
C544
104p/16V/1005
8
SS
4
GND
MP2307
R543
C548
392/1005
105p/16V/2012
TP543 TP543
B
PCB_TP10 PCB_TP10
+12V
C556 C556 C557 C557
R548 R548
106p/25V/3216 106p/25V/3216 106p/25V/3216 106p/25V/3216 103/1005 103/1005
7
C566 C566
R554 R554
8
105p/16V/2012 105p/16V/2012
4
C568 C568
392/1005 392/1005
104p/16V/1005 104p/16V/1005
C
FRC DDR1 2.5V
VTT, Vref
TP545
PCB_TP10
+2V5FRC
C563 U545
226p/6.3V/2012
1
2
C573
3
4
100uF/16V/BLA/S
5
6
7
D C576
104p/16V/1005
All location are from 541 to 580
1
2
C541 Vout = 0.925 * (R1+R2)/R2
R558
103p/50V/1005
750/F/1005
L541
4.7uH/SPC7040-4R7/3.5A
D541
OPEN-B340A
3
R556
SW
OPEN-104/1005
1 2
5
FB
D543
C580 OPEN-LL4148
6
COMP
C577
822p/25V/1005
OPEN_561p/50V/1005
MAX: 3A R541
4021/F/1005
C555 Vout = 0.92 * (R1+R2)/R2
R559
103p/50V/1005
750/F/1005
L542
4.7uH/SPC7040-4R7/3.5A
D542
OPEN-B340A
R549
U544 U544 243/F/1005
3 R557
EN SW
OPEN-104/1005
1 2
5
SS FB
D544
C571 C567 OPEN-LL4148
6
GND COMP
C571 822p/25V/1005 R552
MP2307 MP2307
OPEN-561p/1005
912/F/1005
R553
4021/F/1005
MAX: 3A
FRC_VTT FRC_VREF
SOIC14
14
VDD VDDQ
13
VDD VREFOUT
R555
12
C575
VTTFORCE VSSQ
103/1005
11
102p/50V/1005
VSS /SHDN
10
VSS VREFIN
9
VTTFORCE VTTSENSE
8
VDD VSS
C578
FAN1655M
C572
102p/50V/1005
102p/50V/1005
C562
C574
226p/6.3V/2012
104p/16V/1005
2
(No.YA707<Rev.001>)2-39
3
TP542
PCB_TP10
+1V2FRC
[FRC Core]
+3V3FRC
+1.28V
R544
302/F/1005
C549
R1
C547 106p/10V/2012
100uF/16V/MVK/S
R545
912/F/1005
R2
OPEN_104p/16V/1005
C545
C546
226p/6.3V/2012
226p/6.3V/2012
TP544
+3V3FRC +3.34V,
PCB_TP10
+3V3DIG
Max.2.5A
L543
BLM18PG300SN1D
C561
226p/6.3V/2012
R1
C560
220uF/16V/BLA/S
R2
C558
226p/6.3V/2012
C559
226p/6.3V/2012
TP546
PCB_TP10
TP547
PCB_TP10
C579
220uF/16V/MVK/S
3
2-40(No.YA707<Rev.001>)
4
+5V
TP548
PCB_TP10
U542
RT9018B25PSP
3 6
VIN VOUT
C550
104p/16V/1005
R1
2
R546 EN
103/1005
4 7
VDD ADJ
8 5
GND NC
R2
C551
9 1
TAP PGOOD
C552
Max.3A
105p/25V
MAIN PWB ASS'Y(16/46)
[FRC POWER [DC/DC]]
HU-71100006
4
5
A
TP549
PCB_TP10
+2V5FRC
[DDR1]
+2.49V
R547 C553 C554
272/F/1005
104p/16V/1005
106p/10V/2012
R550
132/F/1005
R551
104/1005
Vout=0.8V(R1+R2)/R2
B
C
D
5
hb1_main_0612_14/48_0.0